Process for treating wood



Patented Feb. 24, 1925.

if UNITED STATES 1,527,330 PATENT OFFICE.

GEORGE E. RICE, OF BROOKLYN, NEW YORK, ASSIGNOR 'IO SU-DEX WOOD CURING COMPANY, INC., OF COSCOB, GONNECTICUT,A CORPORATION OF DELAWARE.

1T0 Drawing.

T 0 all whom it may concern. I

Be it known that I, GEORGEKE. RI E, a c tizen of the United States, and resident of the borough of Brooklyn, in the county of.

invention relates to a special subclass of saccharine processes, in which asolution of mixed carbohydrates is utilized, such a mixed carbohydrate solution being defined as a saccharine or sugar solution Which also contains one or more other carbohydrates? An example of a mixed carbohydrate solution is described in the Letters Patent of William Powell, datedMarch 18, 1919, and numbered 1,297 ,491, wherein the solution is described as a saccharine solution, with or without an insecticide, and containing one or more other carbohydrates, such as starch, dextrin or gum.

My present improved process for treating wood relates more especially to treating the same for all kinds of fungi and insect and parasite proofing, weather proofing, water proofing, etc. I employ a mixed carbohydrate solution similar to that described in the aforesaid Powell patent. The details of the process are changed. to include a bath of a ten per cent solution of paradichlorobenzene in kerosene oil heated over a closed steam coil which is covered in a sand box, as-I shall hereafter describe.

My improvement on said Powell saccharine process consists in the following changes: After the wood. has been immersed'in a solution of sugar or syrup and dextrin, and boiled therein until the boiling is complete, or immersed in a solution of sugar or syrup, dextrin and alum, and boiled therein until the boiling is complete, the wood is removed at once and placed in a solution of paradichlorobenzene in kerosene oil heated over a closed steam coil which is covered in a sand box, said solution being raocnss Eon TREATING woon.

Application filed July 22, 1922. Serial n 5. 57e,s7s.

ing, and similar purposes, I prepare first an aqueous saccharlne solution of sugar or syrup of any kind and dextrin. The saccharine solution preferably has a specific gravity of about 1080". The dextrin added to the saccharine solution amounts, for example, to about 5%. The amount of alum used may vary, depending on the kind of wood being treated, and is determined by tests. In some cases I add a little gum, as gum tragacanth, say and alittle arsenic or arsenated calcium, say 2% to 4%. The woodror timber is placed in this solution and boiled until sufficiently free of deleterious matters. When boiling is complete and the wood is cured, the wood is quickly removed and placed in a solution of paradichlorobenzene in kerosene oil heated over a closed steam coil which is covered in a sandbox, said solution being heated to between 110 to 160 F. The wood is allowed to remain for periods that vary with the thickness and density of the timber. In processing porous lumber the initial solution will contain sugar or syrup, dextrin and alum, and when boiling is complete Very little impregnation will be allowed during cooling.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. The herein-described rocess for the curing and treating of W008 for fungi, insect, weather and water proofing, which consists in impregnating it with a saccharine solution containing dextrin and alum, and then subjecting it to a bath of paradichlorobenzene. l

2. The herein-described process for the treatment of wood, which consists in boiling the wood in a solution of sugar and dextrin, and then subjecting it to a bath of heated paradichlorobenzene.

3. The herein-described process for the treatment of wood, which consists in boiling it in a solution of sugar and dextrin, and then boiling the same in paradichlorobenzone and kerosene oil,

1. The herein-described process for the treatment of porous lumber, which consists in placing the lumber in a solution of sugar,

(lPXlliH, and alum, boiling the same, then placing it in a bath ofparadichlorob-enzene and allowing very little impregnation during cooling.

5. The herein-described process for treating wood for germ and fungi proofing and other purposes, which consists 1n immersing it in a solution containing sugar and dex Water proofing, and other uses, which con- 20 sists in immersing it in a solution containing sugar and dextrin, boiling the same, then immersing the Wood in paradichlorobenzene and kerosene at a temperature between 110 and 160 F.

In testimony whereof I hereunto aflix my signature.

GEORGE E. RICE. 

